冲洗出来的照片和胶卷,不应带有任何脏污痕迹,但往往不易办到。有时在显影、定影或水洗过程中会生成,有时加工后的片子很干净,在保存中又出现了污斑。照片上有污迹还可以重印一张,但是底片则不然,有时很难重新补照,因此必须设法把上面的污斑去掉。 Rinse out of photos and film, should not have any traces of dirt, but often difficult to do. Sometimes in the development, fixing or washing process will be generated, and sometimes after processing the film is very clean, there are again in the preservation of the stain. Smudges can also be reprinted in the photo, but the negatives are not, sometimes it is difficult to re-fill, so we must try to get rid of the above stains.